Level Select
Square Triangle Circle Triangle Triangle Square Circle

Once in the game, you can change levels and zones and turn collision off by:
1. During game play, press Select and Start simultaneously
2. Select level, zone, and collision state using the directional pad
3. Press L1

Unlock Fourth Ship
Triangle Circle Circle Triangle Square Circle Square.

Unlock Classic Asteroids Game
Circle Circle Circle Triangle Square Square Circle.

Unlock Classic Asteroids Game
Circle Circle Circle Triangle Square Square Circle.

Hint
On the Title Screen when PRESS START is flashing Hold Select and press the following buttons in order. You will hear a sfx prompt, when the cheat is activated.